Dynamic memory allocation in 2d array

Question

The scanf statement is giving me trouble. I have tried &arr[i][j] and (arr+i)+j in place of *(arr+i)+j. However, this statement is still giving problems. Here is my code:

int **arr, m, n, i, j;
scanf("%d%d", &m, &n);
arr = (int **) malloc( m * sizeof(int *) );

for (i = 0; i < m; i++)
  arr[m] = (int *) malloc(n*sizeof(int));

for(i = 0; i < m; i++)
  for(j = 0; j < n; j++)
    scanf("%d", *(arr + i) + j); //this statement

for(i = 0; i < m; i++) {
  for(j = 0; j < n; j++) {
    printf("%d ", *(*(arr + i) + j));
  printf("\n");
}

getch();
return 0;

@timrau firstly i want user to enter no of rows and column into m and n variables respectively, then i tried allocating memory for them. then user will enter numbers — gj1103
– gj1103, Commented Mar 19, 2014 at 14:29

timrau · Accepted Answer · 2014-03-19 14:29:59Z

2

There is a severe typo:

  arr[m] = (int *) malloc(n*sizeof(int));

Should be

  arr[i] = malloc(n * sizeof(int));

edited Mar 19, 2014 at 14:29

answered Mar 19, 2014 at 14:15

timrau

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6 Comments

gj1103 Over a year ago

i tried &arr[i][j] as well, its not working. my debugger stops at this statement. Is there something wrong with the way i m using malloc? looks like i m using the adresses in a wrong way

timrau Over a year ago

Since the way you call malloc looks fine, we need your input format to diagnose the problem.

timrau Over a year ago

Any message when your debugger stopped there? Is it waiting for your input?

gj1103 Over a year ago

error waa like: Unhandled exception at 0x0f75effe in spiral.exe: 0xC0000005: Access violation writing location 0xcdcdcdcd.

gj1103 Over a year ago

firstly i want user to enter no of rows and column into m and n variables respectively, then i tried allocating memory for them. then user will enter numbers input sample: 3 4 1 2 3 4 5 6 7 8 9 10 11 12 where 3 and 4 are no of rows and columns

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